Japanese Journal of Ichthyology Vol.31,No.41985 魚 類 学 雑 誌 31巻4号1985年

A Revision of the Eleotrid Goby Odontobutis in ,Korea and China

Akihisa Iwata,Sang-Rin Jeon,Nobuhiko Mizuno and Ki-Chul Choi Received May 16,1984) (

Abstract The eleotrid goby genus Odontobutis in Japan,Korea and China is represented by two species and three subspecies i.e., O.obscura obscura,O.o.potamophila,O.o.interrupta subsp.nov. and O.platycephala sp.nov.The genus is characterized by the presence of smooth,feeble crests on the dorsal sides of the eyes,by the absence of a spine on the preopercle,by the absence of teeth on the vomer,by the wide gill openings,by the larger interorbital width to eye diameter ratio and by the predorsal scales which extend forward on the upper surface of the head to between the hind nostrils. is distinguished from 0.obscura by the presence of two sensory canals on the preoperculomandibular pit line.0.o.potamophila and O.o.interrupta are disin - guished from O.o.obscura by the presence of one postocular sensory canal on the supraorbital pit line.O.o.interrupta is distinguished from 0.o.potamophila by the infraorbital connected to the verticalantorbital pit line and the interrupted cross bands on the body.Each of O.o.obscura, O.o.interrupta and O.o.potamophila is distributed in western Japan,the western coastal slope of Korea and China,respectively.O.platycephala occurs throughout Korea except along the northern coast.

The eleotrid goby genus Odontobutis has been Nichols(1943)recognized E.potamophila as represented by only one species,O.obscura different from O.obscura and changed the (Temminck et Schlegel),distributed throughout generic name of potamophila from Odontobutis the freshwaters of Japan,Korea,China and the to Philypnus. Philippines. This study,by examining materials collected Eleotris obscura Temminck et Schlegel,1848 from Japan,Korea and China,revealed that was described from near Nagasaki,Kyushu, the genus contains two species,O.obscura and Japan.The genus Odontobutis with obscura as O.platycephala sp.nov.,and the former con- the type species was erected by Bleeker(1874). sists of three subspecies obscura,potamophila This generic name was used by the following and interrupta subsp.nov. authors:Jordan and Snyder(1901a),Herre (1927),Koumans(1953)and Miyadi et al. Materials and methods (1976).Jordan and Seale(1905)transferred Measuring and counting procedures followed this species from Odontobutis to Mogurnda and Hubbs and Lagler(1958)with the following some authors followed them:Tomiyama(1936), additions.Body depth was measured at the Jeong(1954,1977),Matsubara(1955),Aoyagi pectoral origin,body width at the first dorsal (1957),Okada(1959-60)and Fowler(1962). origin,head width at the preopercular margin Jordan and Synder(1901b)altered the species and head depth at the postocular.Lateral name from obscura to obscurus,and Nakamura scale rows were counted from the upper end of (1963)followed them. the gill opening to the base of the caudal fin, On the other hand,two species of Odonto- transverse scales from the origin of the second butis,O.potamophila and 0.wui,were re- dorsal fin to the anal base.Lateral scales with ported from China. pit organs were defined as the scales which pos- (Giinther,1861)was synonymized with M. sesses pit organs.Counts for vertebrae were obscura by Tomiyama(1936),Okada(1959-60) taken from radiographs.Observations of the and Fowler(1962).O.wui(Chen,1934)was arrangement of pit organs and sensory canals synonymized with M.obscura by Fowler(1962) . were made on specimens stained with cyanine.

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The materials examined are listed in each gill openings,while Odontobutis is characterized species account.In the lists of materials,data by the presence of smooth bony crests on the for the specimens are given in the following dorsal side of eyes and quite wide gill openings. order:catalogue number,number of individuals, Therefore,we separate Odontobutis from Mog- standard length,collecting locality,collecting urnda. date.Abbreviations for the catalogue numbers of the specimens are:NSMT-P,Department of Key to the species of Odontobutis Zoology,National Science Museum,Tokyo; Fig.1) ( HUMZ,Laboratory of Marine Zoology,Faculty 1(6)Sensory canals absent on preoperculoman- of Fisheries, University;MTUF,the dibular pit line;first dark crossbands Museum of Tokyo University of Fisheries; from half the middle of the first dorsal fin YCM-P,Yokosuka City Museum;ZUMT, downward.

Department of Zoology,University Museum, 2(3)Sensory canal absent at postocular on

University of Tokyo;EUB,Laboratory of supraorbital pit line(Japan)

Biology,Faculty of Science,Ehime University; •c O.obscura obscura LICPP,Laboratory of Ichthyology,the Crown 3(2)Sensory canal present at postocular on Prince's Palace,Tokyo;SMWU,Sang Myung supraorbital pit line(Sensory canal c in Women's University,Seoul;BMNH,British Fig.1C-F). Museum(Natural History),London;RMNH, 4(5)Infraorbital and verticalantorbital pit lines Rijksmuseum van Natuurlijke Historie,Leiden; pit lines 6 and 7 in Fig.1G-H)not (con- USNM,National Museum of Natural History, nected(China)O.o.potamophila Smithsonian Institution,Washington. 5(4)Infraorbital and verticalantorbital pit line connected;dark bands on body interrupted Genus Odontobutis by pale longitudinal line on each darsal Odontobutis Bleeker,1874,p.305(type-species, side(Korea)0.o.intetrupta subsp.nov. Eleotris obscura Temminck et Schlegel,1848). 6(1)Two sensory canals(d-e in Fig.1H)pre- Diagnosis.Preopercle without spine;no sent on preoperculomandibular pit line, teeth on vomer;gill openings continued forward also three(a-c in Fig.1G)on supra- below eyes;smooth,feeble bony crests on orbital pit line:first dark crossbands on dorsal sides of eyes;interorbital width wider body occupying the area from posterior than eye diameter;predorsal scales are extended half of first dorsal fin to origin of second forward on upper surface of head to between dorsal fin(Korea) hind nostrils;tongue round,mostly free. •cO. platycephala sp.nov. Description.First dorsal spines VI-VIII, third or fourth spine longest;second dorsal rays Odontobutis obscura obscura 7-10;anal rays 5-9;pectoral rays 13-17;pelvic Temminck et Schlegel)( I,5;lateral scale rows 31-51;lateral scales with Japanese name:Donko)( pit organs 25-34;transverse scales 12-24; Figs.1A,B,2A)( predorsal scales 20-40;branchiostegal rays 6; Eleotris obscura Temminck and Schlegel,1848,p. abdominal vertebrae 13-16;caudal vertebrae 149,pl.77,figs.1-3(near Nagasaki,Kyushu, 14-18;total vertebrae 28-33.Pelvic fins sepa- Japan). rated.Two dorsal fins separated.Body stout. Odontobutis obscura:Bleeker,1874,p.305(near Head large,cheek and opercle scaled.Mouth Nagasaki,Kyushu,Japan). large,oblique,maxillary reaching below anterior Odontobutis obscurus:Jordan and Synder,1901b,p. border of eye.Lower jaw prominent.Con- 43(Kurume,Tokyo,Japan);Nakamura,1963, ical teeth in rows on both jaws. p.187,fig.140(Otsu,Japan). Mogurnda obscura:Jordan and Seale,1905,Chinese Remarks.Many authors synonymized Odon- specimens,none described from Japan;Aoyagi, tobutis with Mogurnda(Jordan and Seale,1905; 1957,p.214,figs.179-180(Japan);Okada,1959- Tomiyama,1936;Matsubara,1955;Aoyagi, 60,p.649,fig.112(Japan). 1957;Okada,1959-60;Fowler,1962).Mogurnda Material examined.Holotype:RMNH 2040 a, has no bony crests on the head and medium wide 133.0mm SL,near Nagasaki,Kyushu,Japan,col-

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C

B D

E G

F H Fig.1.Schematic figures of the sensory canals and pit organs of Odontobutis.A,B,Odontobutis obscura obscura;C,D,0.o.potamophila;E,F,O.o.interrupta;G,H,O.platycephala. lecting date unknown. River,Usa-gun,Ohita Pref.,Jan.4,1980;NSMT-P Paratypes:RMNH 2039 a-d and 2040 b-e,near 22401,6,29.5-37.1,Uji River,Takao-gun,- Nagasaki,Kyushu,Japan,collecting date unknown. fu,May 12,1979:HUMZ 101282-101285,4,77.7- Additional specimens :312 specimens.NSMT-P 95.1,collecting locality same as in NSMT-P 22396, 22396,5,98.3-120.8,Kawabe River,Minokoshi, July 13,1979;HUMZ 101286-101294,9,28.0-50.4, Kita-gun,Ehime Pref.,July 22,1979;NSMT-P Ishide River,Matsuyama-shi,Ehime Pref.,May 17, 22397,20,73.3-82.6,collecting locality same as in 1979;HUMZ 101295-101296,2,88.4-121.5,Hiji NSMT-P 22396,July 22,1980;NSMT-P 22398,4, River,Hataki,Ohzu-shi,Ehime Pref.,Sep.15,1979; 19.3-68.9,Ichijo River,Yasuhaga-cho,Fukui-shi, HUMZ 101297,1,43.9,Shigenobu River,Mori- Fukui Pref.,Nov.1,1979;NSMT-P 22399,1,83.4, matsu,Ehime Pref.,May 5,1979;HUMZ 101298, ,Furuse,Gose-shi,Nara Pref.,Oct. 1,56.9,collecting locality same as in HUMZ 101297, 27,1979;NSMT-P 22400,2,47.2-69.0,Mimata May 9,1979;HUMZ 101299-101300,2,109.6-

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125.1,collecting locality same as in NSMT-P 22396, 1983.11.4.14-17,4,38.3-90.1,Arieda River,Ueda, Apr.28,1980;HUMZ 101301-101306,6,21.8- Kamiukena-gun,Ehime Pref.,Aug.5,1979;BMNH 35.4,Hatahoko River,Kofure,Iki-gun,Nagasaki 1983.11.4.18,1,86.8,,Futasebashi, Pref.,Sep.13,1980:MTUF 25018,15,19.8-120.4, Kamiukena-gun,Ehime Pref.,Aug.5,1979:USNM Kannon River,Ushinotani,Fukui Pref.,Nov.1, 264892,7,61.4-83.2,Arieda River,Yanai,Mikawa- 1979;MTUF 25019,4,82.4-119.2,, cho,Kamiukena-gun,Ehime Pref.,Aug.5,1979; Nishikyo-ku,Kyoto-fu,May 1,1979;MTUF 25020, USNM 264893,4,63.6-89.0,Kuma River,Koudono, 1,67.3,,Yahata-cho,Ayaki-gun,Kyoto- Nishimyoujin,Kuma-cho,Kamiukena-gun,Ehime fu,May 1,1979;MTUF 25021,9,19.8-73.3,Mori- Pref.,Aug.5,1979;USNM 264894,4,34.2-86.3, shita River,Tsukiura-cho,Ishikawa Pref.,Oct.31, Wariishi River,Somano,Omogo-mura,Kamiukena- 1979:YCM-P 12107,3,50.5-126.2,Yogo River, gun,Ehime Pref.,Aug.4,1979;USNM 264895, Yogo-cho,Ika-gun,Shiga Pref.,May 1980; 1,87.8,Wariishi River,Shibukusa,Somano,Omo- YCM-P 12108,1,128.5,Iyono River,Iyono,Suku- go-mura,Kamiukena-gun,Ehime Pref.,Aug.3, mo-shi,Kochi Pref.,Aug.18,1980;YCM-P 12109, 1979;USNM 264896,1,85.0,Omogo River,Nana- 2,58.3-69.1,Kagetsu River,Nobote-cho,Hita-shi, tori,Mikawa-mura,Kamiukena-gun,Ehime Pref., Ohita Pref.,Aug.14,1979;YCM-P 12110,7,27.8- Aug.3,1979.The catalogue numbers of the 82.5,collecting locality and date same as in NSMT- specimens used for body proportional measure- P 22398;YCM-P 12111,11,21.5-86.5,collecting ments were SMWU 112,123,124 and five individuals locality same as in YCM-P 12107,unknown:ZUMT of 125,and those for vertebral counts were HUMZ 54351,3,38.2-106.8,Oda River,Chisei,Kita-gun, 101286-94,101301-306,MTUF 25018-19,25021, Ehime Pref.,June 8,1979;ZUMT 54352,1,67.4, YCM-P 12109-111,EUB.Kyu.25.63.3.2,154,Imi Hiji River,Nomura-cho,Higashiuwa-gun,Ehime and SMWU 112.Additionally,to delineate the Pref.,Sep.16.1979;ZUMT 54353,1,39.5,Higashi- distribution of O.o.obscura,we used the collecting nagato,Matsuyama-shi,Ehime Pref.,May 24,1979; localities of our unpublished data and examined ZUMT 54354,1,46.2,,Masaki-cho, many specimens deposited in the collections of the Iyo-gun,Ehime Pref.,May 17,1980;ZUMT 54355, National Science Museum;Department of Zoology, 8,35.7-139.9,Yanaharaizumi,Shigenobu-cho,Ma- University Museum,University of Tokyo;Labora- tsuyama-shi,Ehime Pref.,May 20,1979:EUB.Kyu. tory of Marine Zoology,Faculty of Fisheries, 25,5,50.2-75.4,Arita River,Furukoba,Nishi- Hokkaido University;Yokosuka City Museum. matsuura-gun,Saga Pref.,Sep.14,1973;EUB.Kyu. Description.Data for the holotype is given 63.3.2,8,57.3-91.2,,Arita-gun,Kago- first,followed by those for paratypes and other shima Pref.,Mar.2,1973;EUB.Kyu.154,1,75.1, specimens in parentheses(see also Tables 1,2 Midori River,Futamata,Kumamoto Pref.,Sep.18, and Fig.3). 1975:EUB.Kyu.Imi,4,27.8-45.8,Imi River,Imi, Higashikunisaki-gun,Ohita Pref.,unknown:SMWU Dorsal fins VII-I,9(VI-VIII-I,7-10);anal 110,54,23.0-124.9,collecting locality and date fin I,8(I,6-9);pectoral fin 15(14-17);pelvic same as in ZUMT 54355;SMWU 111,2,90.9- fin I,5(I,5);lateral scale rows 36(31-41); 132.9,Hiji River,Akaiwa,Kita-gun,Ehime Pref., lateral scales with pit organ(26-30);transverse Sep.16,1979;SMWU 112,8,107.7-134.9,collecting scales 15(12-17);predorsal scales 31(21-33); locality same as in HUMZ 101297,June 23,1979; vertebrae(13-16+15-18=29-31).Pit lines 6 SMWU 113,10,25.3-42.8,collecting locality same and 7 connected and no sensory canals on head as in HUMZ 101286,May 9,1979;SMWU 114,6, (Fig.1A,B).Body stout,posteriorly a little 21.0-40.6,collecting locality same as in HUMZ compressed.Head large,slightly depressed. 101286,Oct.27,1979;SMWU 123,1,36.0,Tobe Pectoral fin reaching below posterior border of River,Morimatsu,Iyo River,Ehime Pref.,Oct.17, first dorsal fin.Pelvic fin short,never reaching 1980;SMWU 124,1,107.1,collecting locality same anus. as in HUMZ 101297,Apr.1979;SMWU 125,64, Color in life:Head and body dark brown, 23.2-89.8,collecting locality and date same as in paler ventrally,sometimes mottled by dusky HUMZ 54355;BMNH 1983.11.4.1-5,5,66,0-124.3, dots.The distinct blackish bands on body; Arieda River,Kamidani,Kamiukena-gun,Ehime Pref.,Aug.5,1979;BMNH 1983.11.4.6-9,4,40.8- first band extending from the middle of the first 68.5,Kuma River,Takayama,Kamiukena-gun, dorsal fin,the second from about the posterior Ehime Pref.,Aug.5,1979;BMNH 1983.11.4.10-13, half of second dorsal,the third on basicaudal; 4,60.4-107.1,Kuma River,Miyanomae,Kami- the first and second bands slightly tapering ukena-gun,Ehime Pref.,Aug.5,1979;BMNH upward.Single dark dot on upper margin of

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A

Fig. 2. A, Odontobutis obscura obscura, YCM-P 12108, 128.5 mm SL , male, Iy-ono River, Japan. B. 0. o. potaniophila, BMNH 1855.3.27.10, 90.0 mm SL, male, Yan-tse River , China. gill opening. Several light dots on ventral side Snyder, 1901b); Yokohama, Kanagawa Pref. of head. Sometimes, especially in small in- (Jordan and Snyder, 1901a); the Tenryu River, dividuals, dark stripes extend from eye to snout Shizuoka Pref. (Nakamura, 1963); Toyama and to lower angle of preopercle. Two dark Pref. (Tomiyama, 1936; Tanaka et al., 1978); dots on base of pectoral. Several irregular Niigata Pref. (Honma and Tamura, 1972). rows of dark blotches on all fins. Amorphous Ecological notes. Habitat preferences of 0 .o. dark dots on first dorsal. Iris mottled with obscura are very wide. It occurs mainly in small dark spots. middle and lower reaches, and occasionally , in Color in formalin : No marked change ex- upper reaches of rivers. It is also found in cept disappearance of dark spots around pupil. lakes, ponds and swamps. The spawning season Sexual dimorphism. Urogenital papilla dis- is from spring to early summer. Males choose tinct; pointed in the male, truncated in the a sheltered breeding ground. Females spawn female. In the spawning season, males become their eggs on the underside of the roof of the black, swelling on the forehead and cheek; tips shelter (usually a rocky shelf). Eggs are laid of all of fins thickened. in a single layer. The male stays in the shelter Distribution. Western parts of Japan (Fig. 4). until the eggs hatch, while the female leaves The eastern limit on the Pacific slope and the soon after spawning. Males often emit croaks Japan Sea slope is the , Aichi Pref. while guarding their spawning territory. Eggs and Ouchi-gata, Ishikawa Pref., respectively. large, about 1.5-2.0 mm in diameter. Egg The collection localities of 0. o. obscura in Japan capsules elliptical with adhesive filaments on one reported by previous authors are as follows : side, their length and breadth about 3.1-4.8 mm, Isozaki, Ibaragi Pref. (Akihito, 1969); Tochigi 1.6-2.3 mm, respectively. Newly hatched ju- Pref. (Aoyagi, 1957); Tokyo, (Jordan and veniles are about 6-7 mm in standard length,

一377一 魚 類 学 雑 誌Japan.J.Ichthyol.31(4),1985 with well developed fin spines and rays,and show specimens collected in North Korea,the northern demersal life without a planktonic stage. part of China or the Philippines. Remarks.Mori(1936)reported O.obscura The arrangement of the pit organs of the from the Tadon River in northern Korea and holotype is not an usual pattern;pit lines 6 and the Han,Gum,Yongsan,Somchin and Naktong 7 were separated,pit lines 17 and 19 were con- rivers in the south.In this study,the specimens nected.Such individuals were rarely found in identified as O.o.obscura could not be found Kyushu.Additionally,one specimen having in Korea.We had no opportunity to examine canal c collected from Ishikawa Pref.was found

Table 1.Frequency distributions of meristic counts of Odontobutis.

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Fig. 3. Relationship between abdominal and caudal vertebrae in Odontobutis. O.o.o., O. obscura`obscura; O.o.p., O. o. potamophila; O.o.i., O. o. interrupta; O.p., O. platycephala. Figures in each square indicate number of individuals. * Including the holotype.

Fig. 4. Geographic distribution of O. obscura obscura. A, Ouchi-gata; B, Toyo River.

in 523 samples. The dark crossband of this bination. specimen showed the character of O. o. obscura. We regard this individual as the exceptional Odontobutis obscura potamophila fish within the population of O. o. obscura (Gunther) because of its coloration and geographical dis- (Japanese name: Kara-donko) tribution. No specimens of this subspecies had (Figs. 1C, D, 2B) canals a, b, d and e, individually or in any com- Eleotris potamophila Giinther, 1861, p. 557 (Yan-tse

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River, China). potamophila, no marked differences are found Material examined. Holotype: BMNH 1855.3. between O. o. potamophila and O. o. obscura in 27.10, 90.0 mm SL, male, Yan-tse River, China, these matters. Mar. 27, 1855. Remarks. The presence of canal c and the Paratype : BMNH 1861.11.7.4, 130.4 mm SL, interruption of pit lines 6 and 7 are important female, Yan-tse River, 230 miles from river mouth, key characters to distinguish O. o. potamophila China, Nov. 7, 1861. from O. o. obscura. The former subspecies is Additional specimens : NSMT-P 3319-6, 114.0 mm SL, male, Shanghai, China, collecting date also characterized by longer and higher fins than unknown; NSMT-P 3319-7, 116.0 mm SL, male in O. o. obscura. The Hydrobiological Labor- Shanghai, China, collecting date unknown. atory of Chinese Scientific Academy (1982) Description. Data for the holotype is given exhibited a color plate of O. obscura from the first followed by those for paratype and other Yan-tse River. The appearance of this speci- specimens in parentheses (see also Tables 1, 2 men corresponded to the characters of O. o. and Fig. 3). potamophila. Dorsal fins VI-I, 8 (VI-VIII-I, 8-9) ; anal fin Mori (1936) reported Eleotris potamophila I, 7 (I, 7-8) ; pectoral fin 15 (14-15) ; pelvic fin from the Yalu, Chongchon and Tadon rivers I, 5 (I, 5); lateral scale rows 36 (34-36); lateral in northern Korea. We could not examine scales with pit organs 27 (25-28) ; transverse specimens collected in North Korea. Li (1981) scales 15 (14-16); predorsal scales 35 (30-33); reported that Preccottus potamophilus occurred vertebrae 13 +15 =28 (14-15 +15 =29-30). in the Amur Subregion, East China Region and Canal c present. Pit lines 6 and 7 interrupted the Chekiang-Fukien Subregion. If Preccottus (Fig. 1C, D). Body stout, posteriorly a little potamophilus described by Li (1981) is identical compressed. Head large, slightly depressed. with O. o. potamophila, this subspecies can be Pelvic fin short, never reaching to anus. found in these areas. Color in spirits: Head and body brownish; Nichols (1943) classified the species potamo- paler ventrally, sometimes mottled with dots. phila into the genus Philypnus. Philypnus and Three distinct blackish bands on body; first Perccottus have teeth on the vomer, but teeth band extending from the middle of the first are absent on the vomer in Odontobutis. If dorsal fin; the second from about the posterior Perccottus potamophilus and Philypnus potamo- half of the second dorsal; the third on basi- phila described by Li (1981) and Nichols (1943) caudal ; width of dorsal part of first and second are identical with O. o. potamophila, their classi- crossbands narrower than that of lateral part. fication on Perccottus and Philypnus is erroneous Single dark dot on upper margin of gill openings. because both genera have teeth on the vomer. Several light dots on ventral side of head. Two Savage and Thiersant (1874) synonimizep dark dots on base of pectoral. Membranes of Eleotris varius with E. potamophila without any first dorsal, anal and pelvic fins dark with several description. We could not find the original light blotches. All fins and rays exhibit irregular description of E. varius by Dabry. rows of dark blotches. As is the case with O. o. obscura, this sub- Sexual dimorphism. Urogenital papilla dis- species exhibits a variation in the presence of tinct ; pointed in the male, truncated in the canals and arrangement of the pit lines. For female. All fins longer or higher in males than example, the paratype has no canal c on the left in females. side. Pit lines 6 and 7 of the right side of Distribution. China. NSMT-P 3319-6 are connected. Ecological notes. We could not observe living specimens of O. o. potamophila. The Odontobutis obscura interrupta Ichthyological Laboratory of Hoopei Hydro- Iwata et Jeon, subsp. nov. biological Institute (1976) described the spawn- (New Japanese name: Semadara-donko) ing habits and ontogeny of O. obscura from the (New Korean name; , Chang River. If O. obscura studied by the 011uktongsari) Ichtyological Laboratory of Hoopei Hydro- (Figs. 1E, F, 5A) biological Institute (1976) is identical with O. o. Material examined. Holotype: SMWU 108, 71.1

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mm SL,male,Gum River,Kumchong-gi,Sayang- urements are:NSMT-P 22392,YCM-P 12106, myon,Chongyang-gun,Chungchongnam-do ZUMT 54356,ten individuals of EUB.K.5, (36•‹25'N,126•‹50'E),Korea,July 21,1979. SMWU 109,USNM 264890;and vertebral Paratypes:NSMT-P 22392,1,113.7,Ham counts were made on NSMT-P 22392-4,HUMZ River,Dokso-ri,Wabu-myon,Namangju-gun,Kyon- 101307-32,MTUF 25025,YCM-P 12104-5, gki-do,Feb.28,1980;NSMT-P 22393,1,89.5, EUB.K.5,SMWU 109,BMNH 1983.11.4.19 Wangsuk River,Sarung-ri,Jingon-myon,Namyang- and USNM 264890-91.Data in parentheses ju-gun,Kyongki-do,Feb.29,1980;NSMT-P 22394- 1-4,4,84.7-101.4,Wangsuk River,Changhyon-ri, apply to paratypes(see also Tables 1,2 and Chinchop-myon,Namysngju-gun,Kyongki-do,Oct. Fig.4). 4,1980:HUMZ 101333,1,173.8,Seoul,Mar.1, Dorsal fins VII-I,9(VI-VII-I,7-10);anal 1980:MTUF 25025,1,91.8,Yetang Reservoir, fin I,7(I,6-8);pectoral fin 15(14-15);pelvic Daehung-myon,Yesan-gun,Chungchongnam-do, fin I,5(I,5);lateral scale rows 35(33-40); May,1976:YCM-P 12104,12,23.0-73.7,collecting lateral scales with pit organs 28(26-30);trans- locality and date same as in NSMT-P 22394,YCM- verse scales 14(14-18);predorsal scales 26(20- P 12105,5,53.1-68.6,collecting locality same as in 30);vertebrae 14 +15=29(14-16+14-16=29- NSMT-P 22394,Mar.1,1980;YCM-P 12106,1, 31).Sensory canal c present.Pit line 6 and 116.1,Chochong River,Hyon-ri,Ha-myon, Kapyong-gun,Kyongki-do,Feb.23,1980:ZUMT 7 are connected.(Fig.1E,F).Body stout, 54346,1,153.0,Kum River,Pyuo-gun,Chung- posteiorly a little compressed.Head slightly chongnam-do,May 14,1967;ZUMT 54357-54360, depressed.Pelvic fin short,never reaching to 4,39.9-118.0,Ungchon River,Oesan-River,Oesan- anus. myon,Puyo-gun,Chungchongnam-do,Apr.21, Color in life:Head and body brownish; 1981:EUB.K.5-5-16,12,51.1-93.1,Saje River, paler ventrally,sometimes mottled by dusky Hungob-ri,Hungob-myon,Wonsong-gun,Kangwon- dots.Three distinct blackish bands on body; do,June 28,1973;EUB.K.6M-1-2,2,36.5-44.8, the first extending from the middle of the first Muhan River,Chugyo-ri,Yesan-gun,Chungchon- dorsal fin;the second from about the posterior gnam-do,June 29,1973;EUB.K.6.S-1-3,3,Sapkyo half of the second dorsal;the third on basi- River,Sapkyo-myon,Yesan-gun,Chungchongnam- caudal;anterior two interrupted by a pale do,June 29,1973:SMWU 109,1,84.4,Gum River, longitudinal line on each dorsal side.Two Ubnae-ri,Chongyang-myon,Chongyang-gun, Chungchongnam-do,July 25,1979;SMWU 122, dark spots on base of pectoral.One dark dot 1,104.5,Kapyong River,Kapyong-ub,Kapyong- on upper margin of gill opening.Several light gun,Kyongki-do,June 6,1976:BMNH 1983.11.4.19, spots on the ventral side of the head.Several 1,112.2,collecting locality and date same as in irregular rows of dark blotches on all fins,some- YCM-P 12106;BMNH 1983.11.4.20,1,82.4,col- times connecting.First dorsal with amorphous lecting locality same as in NSMT-P 22394,Mar.1, dark dots.Iris mottled with small dark dots. 1980:USNM 264890,1,114.1,South Han River, Color in formalin:No marked change ex- Yangpyong-ub,Yangpyong-gun,Kyongki-do,Feb. cept disappearance of dark spots around pupil. 1980;USNM 264891,3,84.8-97.0,Sudong River, Sexual dimorphism.Urogenital papilla dis- Sudong-myon,Namyangju-gun,Kyongki-do,June tinct;pointed in the male,truncated in the 1980. female.During the spawning season,males Additional specimens:HUMZ 101307-101332, become darker,swelling on forehead and cheek, 26,26.7-51.4,collecting locality and date same as in NSMT-P 22393:LICPP 1980154,5,collecting tips of fins thickened. locality and date same as in USNM 264891;LICPP Distribution.Collecting localiteis in the pres- 1980155,5,collecting locality and date same as in ent study fall within the West Korea Sub- NSMT-P 22393. district given by Jeon(1980).This subspecies Diagnosis.One sensory canal present post- is,however,not found south of the Gum River ocularly on supraorbital pit line.Infraorbital (Fig.6). and verticalantorbital pit lines connected.Dark Etymology.The latin name interrupta refers crossbands on body interrupted by a pale lon- to the situations of dark crossbands on the body. gitudinal line on each side. Ecological notes.O.o.interrupta occurs Description.The catalogue numbers of the mainly in the middle and lower reaches of the specimens which were used for proportion meas- river.Based on our underwater observations

―382― Iwata et al.: Revision of Odontobutis

A

B

Fig. 5. A, Odontobutis obscura interrupta, subsp. nov., holotype, SMWU 108 , 71.1 mm SL, male, Gum River, Korea. B, 0. platycephala, sp, nov., holotype , SMWU 101, 130.3 mm SL, male, Somchin River, Korea.

made in a lower branch of the Han River, they were observed in slow-moving regions. Oc- Odontobutis platycephala Iwata et Jeon, casionally, some individuals hover in such areas. sp. nov. Spawning season is from spring to early summer. (New Japanese name : Kourai-donko) No marked differences are found between 0. o. (New Korean name : , Tongsari) interrupta and 0. o. obscura in spawning habits ; (Figs. 1G, H, 5B) size, shape and nature of eggs; development Material examined. Holotype: SMWU 101,, stages and size of newly hatched juveniles; 130.0 mm SL, male, Somchin River, Kyeso-ri , Maryong-myon, Chinan-gun, Chonrapuk-do except the fact that young juveniles of the former subspecies hover for lengthy periods. (35°44'N, 127°20'E), Korea, Oct. 3, 1980. Paratypes: NSMT-P 22388, 8, 29.9-189.4 Remarks. 0. o. interrupta is distinguished , Nam River, Soju-ri, Yurim-myon, Hamyang-gun, Kyong- from 0. o. obscura by the presence of canal c. sangpuk-do, Oct. 1, 1980; NSMT-P 22389, 9, 50.9- Connection of pit lines 6 with 7 and interrupted 106.4, Naktong River, Chomchin-ub, Munkyong- crossbands on the body are also useful charac- gun, Kyongsangpuk-do, Sep. 1980; NSMT-P 22390, ters to divide 0. o. interrupta from 0. o. potamo- 4, 43.5-173.1, Nam River, Hamyang-ub, Hamyang- phila. The individual with canal b was found gun, Kyongsangnam-do, May, 8, 1981: HUMZ in the Gum River (one specimen in 93 total 101334-101336, 3, 34.4-85.4, collecting locality same examined samples). Variations in pit organ as in SMWU 101, May 10, 1981; HUMZ 101363, arrangement also can be rarely observed in this 1, 54.0, Mankyong River, Yangki-ri, Pongtong-ub , subspecies, for example, pit lines 6 and 7 sepa- Wanju-gun, Chonrapuk-do, Aug. 16, 1977: MTUF 25022, 1, 112.8, Chochong River, Hyon-ri, Ha- rated. hyon, Kapyong-gun, Kyongki-do, Feb. 22 Further investigations of Chinese specimens , 1980; MTUF 25023, 1, 131.6, Somchin River, Naksu-ri , are required in order to clarify the relation of Songkwang-myon, Sungju-gun, Chonranam-do, 0. o. potamophila and 0. o. interrupta and the Aug. 8, 1976; MTUF 25024, 10, 49.2-77.7, Sudong constructions of this genus. River, Unsu-ri, Sudong-myon , Namyangju-gun,

一383一 魚 類 学 雑 誌 Japan. J. Ichthyol.31(4),1985

Nam River, collecting locality and date same as in EUB.K.12; EUB.K.15, 2, 21.5-83.0, Nam River, Sutong-myon, Hamyang-gun, Kyongsangnam-do, July 1, 1973: SMWU 102-103, 2, 142.0-142.3, Han River, Kapyong-ub, Kapyong-gun, Kyongki-do, June 6, 1976; SMWU 104-107, 4, 72.2-87.9, col- lecting locality and date same as in SMWU 101; SMWU 115-116, 2, 103.3-117.4, Han River, Chun- chon-si, Kangwon-do, Sep. 30, 1980; SMWU 117- 121, 5, 76.8-94.5, collecting locality same as in YCM-P 12101, Mar. 1980: BMNH 1983.11.4.21, 1, 123.0, Pyongchang River, Pyongchang-gun, Kang- won-do, Oct. 1979; BMNH 1983.11.4.22-27, 6, 76.2-103.4, Gum River, Kangkyong-ub, Nonsan- gun, Chungchongnam-do, Mar. 8, 1980; BMNH. 11.4.28-29, 2, 75.4-79.3, collecting locality and date same as in MTUF 25022: USNM 264888, 1, 68.3, Gum River, Toam-ri, Kumnam-myon, Yonki-gun, Chungchongnam-do, July 29, 1979; USNM 264889, 4, 87.1-150.4, collecting locality and date same as in SMWU 101. Additional specimens: HUMZ 101337-101362, 26, 96.0-155.4, collecting locality and date same as in NSMT-P 22389; HUMZ 57342-57346, 5, 51.8-86.9, Milyang River, Milyang-ub, Milyang-gun, Kyong- Fig. 6. Geographic distribution of Odontobutis sangnam-do, Aug. 26, 1976; HUMZ 57295-57297, in Korea. Open circle, O. obscura inter- 3, 44.7-76.0, collecting locality same as in EUB.K.10, rupta; solid circle, O. platycephala. Arrow Sep. 1, 1976; EUB.K.14, 58, 68.4-95.4, collecting indicates the Gum River. locality same as in NSMT-P 22390, July 1, 1973; LICPP 1980152, 5, collecting locality same as in Kyongki-do, June 1980: YCM-P 12101, 1, 87.1, NSMT-P 22389, Oct. 1980; LICPP 1980153, 5, Kukruk River, Shinchon-ri, Songchong-ub, Kwang- collecting locality and date same as in SMWU 101. san-gun, Chonranam-do, May 9, 1981; YCM-P 12102, 5, 98.1-124,6, collecting locality and date Diagnosis. Two sensory canals present on same as in SMWU 101; YCM-P 12103, 7, 23.0- preoperculomandibular pit line, also three on 86.6, Wangsuk River, Changhyon-ri, Chinchop- supraorbital pit line. First dark crossband on myon, Namyangchu-gun, Kyongki-do, Oct. 4, 1980: the body seen from the latter half of first dorsal ZUMT 54361-54362, 2, 65.3-65.6, collecting locality fin to the origin of second dorsal fin. same as in HUMZ 101334-101336, Aug. 15, 1977; Description. The catalogue number of the ZUMT 54363-54365, 3, 31.8-38.1, Gum River, specimens which were used for body proportion Simchon-myon, Okchon-gun, Chungchongnam-do, measurements and vertebral counts is EUB.K. Aug. 29, 1978; ZUMT 54366, 1, 103.1, collecting locality same as in YCM-P 12103, Mar. 1, 1980: 14. Data in parentheses apply to paratypes EUB.K.1, 1, 88.3, Han River, Chongpyong-ri, Oeso- (see also Tables 1, 2 and Fig. 3). myon, Kapyong-gun, Kyongki-do, June 27, 1973; Dorsal fins VI-I, 8 (VI-VIII-I, 7-9) ; anal fin EUB.K.5, 4, 55.2-74.1, Saje River, Hungob-ri, I, 7 (I, 5-8) ; pectoral fin 16 (13-17) ; pelvic fin Hungob-myon, Wonsong-gun, Kangwon-do, June I, 5 (I, 5) ; lateral scale rows 41 (39-51) ; lateral 28, 1973; EUB.K.9, 8, 40.1-115.2, Mankyong scales with pit organs 22 (29-34) ; transverse River, Ubnae-ri, Kosan-myon, Wanchu-gun, Chon- scales 18 (18-24) ; predorsal scales 40 (27-40) ; rapuk-do, June 30, 1973; EUB.K.10, 19, 38.8-93.7, vertebrae 15+17=32 (14-16+16-17=30-32). Somchin River, Kwanchon-myon, Imsil-gun, Chon- Sensory canals a, b, c, d and e present. Pit rapuk-do, June 30, 1973; EUB.K.11, 15, 36.9-108.0, lines 6 and 7 interrupted (Fig. 1G, H). Body Somchin River, Tunnam-myon, Imsil-gun, Chon- rapuk-do, June 30, 1973; EUB.K.12, 2, 84.9-105.0, stout, posteriorly a little compressed. Head Somchin River, Santong-myon, Namwon-gun, large, depressed. Pelvic fin short, never reach- Chonrapuk-do, July 1, 1973; EUB.K.13, 1, 87.9, ing to anus.

一384一 Iwata et al.:Revision of Odontobutis

Color in life:Head and body blackish rather than brownish;paler ventrally.Three distinct black crossbands on body;the first seen from the latter half of the first dorsal fin to the origin of the second dorsal fin;the second about the latter half of the second dorsal;the third on basicaudal.Two dark spots on base of pectoral. Several light small spots on ventral side of the head.All fins exhibit several irregular rows of dark blotches,sometimes connecting.Iris mot- tled with small dark dots. Fig.7.Comparison of the sensory canals of Color in formalin:No marked change except Oxyeleotris marmorata and Odontobutis disappearance of dark spots around pupil. platycephala showing the loss of canals Sexual dimorphism.Urogenital papilla dis- black portions).Sensory canal system( of tinct;pointed in the male,truncated in the Oxyeleotris marmorata and the alphabet female. markings of sensory canal pores are cited Distribution.O.platycephala occurs through- from Akihito and Meguro(1977).Symbols out Korea except for the northern part of the a to e correspond to those of Fig.1G . East Korea Subdistrict defined by Jeon(1980) platycephala corresponds to the portions be- (Fig.6). tween sensory canal pores A'and B of Oxyeleo- Etymology.The latin name platycephala tris marmorata;canal b to between sensory canal refers to the flat head of this species. pores B and C;canal c to between sensory canal Ecological notes.O.platycephala occurs in pores E and F;canal d to between sensory canal the middle and upper reaches of rivers.Ac- pores M'and N,and canal e to between sensory cording to our observations by snorkeling made canal pores N and 0,respectively(Fig.7) . at the upper reaches of the Somchin and Naktong The variations of pit organ arrangement rivers,it is found mainly in slow-flowing pools, rarely occur as in O.obscura,while canals a,b, rarely in rapids.O.platycephala could some- c,d and e can be observed in all individuals times be observed with their ventral half sub- more than 110mm in standard length. merged in the sandy bottom.In the small branch of the Han River where O.platycephala Discussion occurs together with O.o.interrupta,they show Chen(1934)reported Odontobutis wui as new differences in their habitat preference.O. species in China.According to his description, platycephala lives in the fast-moving,middle O.wui has the following characteristics:the part of streams,while O.o.interrupta occurs in interorbital without scales,the tongue truncated, the slow-moving regions.This species,adult the pelvic fin reaching to the anus and the in- and juvenile,never hovers in the water as does terorbital width almost equal to the eye di- O.o.interrupta.The spawning season ranges ameter.These characteristics do not corre- from spring to early summer.No marked dif- spond with those of Odontobutis. ferences are found between O.platycephala and The distribution of sensory canals and pit O.o.interrupta in spawning habits;size,shape organ on the head are considered as very im- and nature of eggs;development stages and size portant for classification of gobiid fishes(Taka- of newly hatched juveniles. gi,1962;Akihito and Meguro,1975a,b,1977,. Remarks.0.platycephala is characterized 1980).That of the O.obscura group which is by the presence of canals a,b,c and e;more found in Japan,Korea and China suggests that scales on the body;flatter head and portions of they are different species rather than subspecies. crossbands on body. As regards these key characters,some specimens Compared with Oxyeleotris marmorata which were found in rare cases;presence of canal c has the most primitive sensory canal structure or interruption of pit lines 6 to 7 in Japanese in gobiid fishes(Akihito,1971),the canals of O. O.o.obscura;connection between pit lines 6 platycephala are retrogressive.Canal a of O. and 7 in Chinese O.o.potamophila;and inter-

•\ 385•\ 魚 類 学 雑 誌Japan.J.Ichthyol.31(4).1985

of Education,Science and Culture,Japan. ruption of pit lines 6 and 7 or absence of canal c in Korean O.o.interrupta.However,the Literature cited possibility of allopatric distribution over these Akihito, Prince. 1969. A systematic examination of countries can be established because they are the gobiid fishes based on the mesopterygoid, secondary freshwater fishes.Therefore,we branchiostegals, pelvic fins, scapula, and sub- regard obscura,potamophila and interrupta as orbital. Japan. J. Ichthyol., 16 (3): 93-114.(In different subspecies. Japanese with English summary). On the other hand,it is reasonable to consiaer Akihito, Prince. 1971. On the supratemporais of platycephala as a different species fromO. O. gobiid fishes. Japan. J. Ichthyol., 18(2): 57-64. obscura because no hybrid specimens between (In Japanese with English summary). platycephala and O.o.interrupta haveO. been Akihito, Prince and K. Meguro. 1975a. On the captured on the western coastal slope of Korea goby Pseudogobius javanicus from Okinawa Pref- ecture, Japan. Japan. J. Ichthyol., 22(1): 46-48. where O.platycephala is sympatric with O.o. (Tn Japanese with English summary). interrunta. Akihito, Prince and K. Meguro. 1975b. Descrip- At any rate,as we had no opportunity to tion of a new gobiid fish, Glossogobius aureus, examine specimens obtained from North Korea, with notes on related species of the genus. Japan. the northern part of China and the Philippines, J. Ichthyol., 22 (3): 127-142. further extensive investigations are required in Akihito, Prince and K. Meguro. 1977. Five species order to clarify the congeners of Odontobutis of the genus Callogobius found in Japan and their more thoroughly. relationship. Japan. J. Ichthyol., 24 (2): 113-127. (In Japanese with English summary). Acknowledgments Akihito, Prince and K. Meguro. 1980. On the six We are grateful to Mr.Alwyne Wheeler, species of the genus Bathygobius found in Japan. Japan. J. Ichthyol., 27 (3): 215-236 (In Japanese British Museum (Natural History) for the loan with English summary). of the type specimens of O.o.potamophila and Aoyagi, H. 1957. General notes on the freshwater Dr.M.J.P.van Oijen,Rijksmuseum van fishes of the Japanese Archipelago. Taishukan Natuurlijke Historie,Leiden for the measure- Shoten, Tokyo, 272 pp.(In Japanese). ment of the types of O.o.obscura.We are also Bleeker, P. 1874. Esquisse d'un systême naturel grateful to Mr.Neal M.Teitler for reviewing des Gobidides. Arch. Neer. Sc. Nat., 9: 289-33L the manuscript.We wish to thank Drs.Takeo Chen, M. J. T. F. 1934. Note on the gobies of the Ito and Yasunobu Yanagisawa of Ehime Uni- collection of the Nankin Metroporitan Museum. versity for giving us helpful advice.Our thanks Bull. Nat. Hist. Natur. Paris., 2(6): 36-39. (In are also extended to the following people for French). Fowler, H. W. 1962. A synopsis of the fishes of providing specimens and useful advice:Drs. China, Part X. Quart. J. Taiwan. Mus., 15 (1/2): Ryoichi Arai and Keiichi Matsuura,the Depart- 1-77. ment of Zoology,National Science Museum, Gunther, A. 1861. Catalogue of the fishes of Tokyo,Mr.Katsusuke Meguro,the Crown Rritish Museum. III. London, xxv+586 pp. Prince's Palace,Tokyo,Drs.Kunio Amaoka, Herre, A. W. 1927. Gobies of the Philippines and Keikichi Hamada,Fumio Yamazaki,Hiroshi the China Sea. Bur. Sci. Manila, Monograph, 23: Onozato and Akira Goto,Hokkaido University, 352 pp., 30 pls. Dr.Yoshiaki Tominaga,University of Tokyo, Honma, Y. and E. Tamura. 1972. A revised list Dr.Ik-Soo Kim,Chompuk University,Mr. of the gobioid fishes (suborder Gobioidei) from Masayoshi Hayashi,Yokosuka City Museum, the waters adjacent to Niigata and Sado Island in Mr.Kazumi Hosoya,Kyoto University,Mr. the Japan Sea. Bull. Niigata Pref. Biol. Soc. Hiroshi Senou,University of the Ryukyus,Mr. Educ., (8): 33-38. Yoshiteru Kimizuka,Mr.Hiroyuki Aizawa and Hubbs, C. L. and K. L. Lagler. 1958. Fishes of the Mr.Kwangsoo Kim.We are thankful to the Great Lakes region. Bull. Cranbrook Inst. Sci., students of the Laboratory of Ecology,Ehime 26: 1-213, pls. 1-44. University for their various criticisms and as- Hydrobiological Laboratory of Chinese Scientific sistance.This work was partly supported by Academy. 1982. The fresh water fishes of a Grant-in-Aid (No.57340035) from the Ministry China in colored illustrations. Technol. Pub.

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Agency, Shanghai, 169 pls. (no pagination). the Japanese waters on the comparative mor- Ichthyological Laboratory of Hoopei Hydrobio- phology, phylogeny, , distribution and logical Institute. 1976. Fishes of the Chang bionomics. Private mimeograph edition, iii+273 River. Sci, Publ. Agency, Peking, iv+278 pp., pp. (In Japanese with English summary). 16 pls. (In Chinese). Tanaka, S., M. Tonoyama, S. Miyazaki, H. Koba- Jeon, S. R. 1980. Studies on the distribution of yashi and A. Mizuno. 1978. Freshwater fishes freshwater fishes from Korea. Won-Ill Press, in Toyama Prefecture, pp.253-306. In Fresh- Seoul, 91 pp.(In Korean with English summary). water flora and fauna in Toyama Prefecture. Jeong, M. K. 1954. Korean fishes. Dept. Corn- Toyama Pref. mer. Indus. R. O. K., 373 pp.(In Korean). Temminck, L. J. and H. Schlegel. 1842-1850. Jeong, M. K. 1977. The fishes of Korea. Illji-Sa Pisces, in Siebold's Fauna Japonica. Leiden, 323 Co. Ltd., pp. 469-470. (In Korean). pp., 144 pls. Jordan, O. S. and A. Seale. 1905. List of fishes Tomiyama, I. 1936. Gobiidae of Japan. Japan. collected in 1882-83 by Pierre Louis Jouy at J. Zool., 7(1): 87-112. Shanghai and Hongkong, China. Proc. U. S. Natn. Mus., 29 (1433): 517-529. (AT: Laboratory of Embryology and Genetics, Jordan, O. S. and J. O. Snyder. 1901a. A list of Faculty of Fisheries, Hokkaido University, 3-1-1 fishes collected in Japan by Keinosuke Otaki, and Minato-cho, Hakodate 041, Japan; SRJ: Sang by the United States steamer Albatross, with Myung Women's University, Hongchi-dong 7, descriptions of fourteen new species. Proc. U.S. Chongno-gu, Seoul, 110, Korea; NM: Department Natn. Mus., 23 (1213): 335-380, pls. 9-20. of Biology, Faculty of Science, Ehime University, Jordan, O. S. and J. O. Snyder. 1901b. A review of 2-5 Bunkyo-cho, Matsuyama 790, Japan; KCC: the gobioid fishes of Japan, with descriptions of Korean Institute of Freshwater Biology, Shinrim- twenty-one new species. Proc. U. S. Natn. Mus., podong 92-368, Kwank-gu, Seoul, 151, Korea) 24 (1244): 33-132. Koumans, F. P. 1953. Gobioidea. In Weber and ドン コ属 魚類 の 再 検 討 de Beaufort: The fishes of the Indo-Australian 岩 田 明 久 ・田 祥 麟 ・水 野 信 彦 ・崔 基 哲 Archipelago. X. E. J. Brill, Leiden, 423 pp. Li, S. 1981. Studies on zoogeographical divisions ド ン コ 属 魚 類 に つ い て 再 検 討 を 行 な っ た 。 ド ン コ 属 for freshwater fishes of China. Sci. Pub. Agency, は,1)平 坦 な 骨 質 隆 起 が 眼 の 背 方 上 部 に あ る 事,2) Peking, iv+292 pp. 前 鯉 蓋 骨 に 棘 が な い 事,3)鋤 骨 に 歯 が な い 事,4)鯉 孔 は 目 の 下 方 ま で 達 す る 事,5)両 眼 間 隔 は 眼 径 よ り Matsubara, K. 1955. Fish morphology and hierarchy Ishizaki Shoten, Tokyo, xi+1605 pp., 135 pls. (In 大 き い 事,6)背 鰭 前 部 鱗 は 鼻 孔 後 方 に 達 す る 事 な ど で 定 義 さ れ る.該 当 種 は ド ン コOdontobutis obscura Japanese). obscura,カ ラ ド ン コO.o.potamophila,セ マ ダ ラ ド Miyadi, D., H. Kawanabe and N. Mizuno. 1976, ン コ(〓)O.o.interruta,コ ウ ラ イ ド ン コ Encyclopedia of Japanese freshwater fishes fully (〓)O.platycephalaで,後2者 は 新 亜 種 お よ illustrated in color. 2nd ed. Hoikusha, Osaka, び 新 種 で あ る. 462 pp., 56 pls.(In Japanese). コ ウ ラ イ ド ン コO.platycephalaは 頭 部 側 線 感 覚 系 Mori, T. 1936. Studies on the geographical dis- に お い て 孔 器 列 の 前 鯉 蓋 下 顎 列 上 に ふ た つ の 感 覚 管 を tribution of freshwater fishes in Chosen. Bull. 有 す る 事 で 他 の ド ン コ 類 と 明 瞭 に 区 別 さ れ る.カ ラ ド Biogeogr. Soc. Japan, 6 (7): 35-61. ン コO.o.potamophilaと セ マ ダ ラ ド ン コO.o.in- Nakamura, M. 1963. Keys to the freshwater fishes terruptaは 眼 上 列 眼 後 部 に ひ と つ の 感 覚 管 を 有 す る 事 of Japan fully illustrated in colors. Hokuryukan, で ド ン コO.o.obscuraと 区 別 さ れ る.カ ラ ド ン コ Tokyo, 260 pp.(In Japanese). .o.potamophilaと セ マ ダ ラ ド ン コO.o.interrupta O Nichols, N. T. 1943. The freshwater fishes of の 差 異 は 前 者 が 眼 下 列 と 眼 前 頬 縦 列 が 分 離 し て い る の China. Natural History of Central Asia. LX. に 対 し 後 者 は そ れ ら が 連 続 し て い る 事 で あ る 。 ま た 後 Amer. Mus. Nat. Hist., New York, xxxvi+322 者 の 体 側 背 方 に は 明 色 帯 が 縦 走 す る た め 暗 色 鞍 状 斑 は pp., 10 pls. 中 断 さ れ る. Okada, Y. 1959-1960. Studies on the freshwater ド ン コO.o.obscuraは 西 日本,カ ラ ド ン コO.o. fishes of Japan. J. Fac. Fish., Pref. Univ. Mie, potamophilaは 中 国 に 分 布 す る.セ マ ダ ラ ド ン コO. 4 (2): 267-869. o.interruptaは 韓 国 の 錦 江 以 北 の 西 韓 亜 地 域 に,コ Sauvage, H. E. and D. D. Thiersant. 1874. Notes ウ ラ イ ド ン コO.platycephalaは 東 韓 亜 地 域 北 部 を 除 sur les poissons des eaux douces de Chine. Ann. く韓 国 全 土 に そ れ ぞ れ 分 布 し て い る 。 Sci. Nat., Paris, Zool., (6) 1 (5): 1-18. Takagi, K. 1962. Studies on the gobioid fishes in (岩 田:041函 館 市 港 町3-1-1北 海 道 大 学 水 産 学 部 発

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生 学遺 伝 学講 座;田:大 韓 民 国110-00ソ ウル特 別市 151-00ソ ウ ル特 別市 冠 岳 区 新 林 本 洞92-368韓 国 淡 鐘 路 区 引 智洞7祥 明女 子 大 学;水 野:790松 山 市文 京 水 生 物 学 研 究 所) 町2-5愛 媛 大 学 理 学 部 生 物 学 教 室;崔 大韓 民 国:

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